There was a rumor that the full sized sub was reconfigured as a rescue sub for The Poseidon Adventure, then scrapped. This can be debunked, since the full-scale Proteus appeared in a 1975 PSA for American Cancer Society. This was four years after the rumored "refit".
The Proteus was designed by Harper Goff. Harper is also known for the design of Disney’s Nautilus (though not given full credit) and the sets for Willy Wonka & the Chocolate Factory.
The full size version was 42’ x 23’
and cost $100,000, weighing in at over
4 tons. It was built in sections, so it could be dismantled for easier filming angles (the interior seen in the film was the actual full sized sub).
Special thanks to:
Jeff Bond, Phil Broad, Doug Drexler, David Gamble, Drew Huffman, Gary Kerr, Rob McFarlane, Richard Tesky, Mark Myers, Jim Shultz, Jörg Winkelmann
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